Turkeys glassy white marble, also known as Carrara marble, is a popular choice for both interior and exterior applications around the world. However, when considering its use in very humid climates, there are several factors to consider:

1. Porosity: Marble is a natural stone and is porous to some extent. In very humid climates, the high moisture content in the air can lead to excessive absorption of water by the stone, which may cause damage over time. To mitigate this, it is vital to choose a high-quality marble with low porosity and excellent sealing properties.

2. Sealing: To protect marble from moisture absorption and potential damage, it is essential to apply a suitable sealer specifically designed for marble. The sealer creates a protective layer on the surface, minimizing the stones exposure to moisture.

3. Maintenance: Regular maintenance is crucial for marble in humid climates. This involves cleaning the surface with mild, pH neutral cleaners and resealing periodically to ensure continued protection against excessive moisture absorption.

4. Testing: It is advisable to conduct a thorough moisture or humidity test on the specific batch of marble you intend to use in a very humid climate. This test will provide valuable information about the stones porosity and suitability for exterior use in such conditions.

Ultimately, while Turkeys glassy white marble can be used in exterior applications in very humid climates, proper selection, sealing, and maintenance are vital to ensure its long-term durability and aesthetic appeal.